Photo by @nicholesobecki | Portrait of Ebola survivor Aisha Ramzani Djadi, 17, in the bedroom of her home in Beni, Democratic Republic of Congo. When she first became ill, Aisha was pregnant and she lost the baby during her treatment. She is just one of many in this central African nation caught between the promise of new anti-Ebola measures and the barriers to their success: widespread fear, mistrust of foreign-run medical relief efforts, and general unrest fed by armed militias, poverty, and despair. As she works to rebuild her life in the wake of great loss, Aisha has returned to care for others fighting the virus at the Ebola Treatment Center in Beni. "I'd like to have more children in the future,” she told me, a nearby window casting light across her young face within the shadowy room where we stood. #ebola#drc#health#survivor

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Photo by William Albert Allard @williamalbertallard | This child wearing one of his papa’s hats is the son of John Hand, a rancher living in New Mexico back in 1971, when I was wandering the American West, taking photographs for the National Geographic book "The American Cowboy in Life and Legend," published in 1972. I don’t recall the boy’s name, but he was out in one of the barns where his father was shoeing a horse, and I found making portraits of the little boy more productive than watching the horse. This is a full, in-your-face portrait showing the boy's soft, smooth skin and dark, pool-like eyes, all accented by the piece of alfalfa clamped in his mouth. His father was a wonderful, highly respected rancher, and I’d like to think the little boy grew up to be the same, but I can’t say for sure. For more images of the American West and other assignments spanning a five-decade career, follow me @williamalbertallard

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Photo by Cristina Mittermeier @CristinaMittermeier | The Rio Pequeno, a tributary of the Iriri in the southern Amazon, was filled with giggles as this group of Kayapo girls played tagalong on its shallow bank. Indigenous communities that directly depend on their natural surroundings for survival develop a unique and intimate relationship with nature. From a young age, these children are raised to believe that if they treat the forest, river, and wildlife with respect and gratitude, they will be provided for by nature, and presented with everything they need to sustain themselves. Is there a lesson there for the rest of us? #FollowMe at @CristinaMittermeier for more photos from around the world. #Kayapo#Amazon#nature#community

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Photo by Anastasia Taylor-Lind @anastasiatl // Sponsored by @always_brand // Schoolgirls receive free period products at a workshop at Thabotona Primary School in Katlehong, South Africa. Teams of students prepared vision boards detailing their dreams for the future and a nurse taught them about female reproductive organs. // Every day, all over the world, millions of girls miss school because they lack resources to navigate the onset of menstruation. @always_brand provides puberty education & period products to girls around the world to help keep them confident #LikeAGirl & focused on getting an education. Together we can #EndPeriodPoverty!

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Photo by Anastasia Taylor-Lind @anastasiatl // Sponsored by @always_brand // Schoolgirls attending Thabotona Primary School in South Africa perform a traditional dance. The girls sang and clapped while they took turns dancing in the yard outside a classroom. // Every day, all over the world, millions of girls miss school because they lack resources to navigate the onset of menstruation. @always_brand provides puberty education & period products to girls around the world to help keep them confident #LikeAGirl & focused on getting an education. Together we can #EndPeriodPoverty!

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Photo by Anastasia Taylor-Lind @anastasiatl // Sponsored by @always_brand // Amelia sits in her bedroom, which she shares with two sisters and her niece, in Katlehong, South Africa. Amelia is at the top of her class, and she is very confident and motivated. She is just beginning puberty and hasn’t started menstruating, but she is very knowledgeable and feels prepared for it when the time comes. “I want to be a doctor. Your body is yours. This body is mine—nobody owns it,” she said. // Every day, all over the world, millions of girls miss school because they lack resources to navigate the onset of menstruation. @always_brand provides puberty education & period products to girls around the world to help keep them confident #LikeAGirl & focused on getting an education. Together we can #EndPeriodPoverty!

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Photo by Anastasia Taylor-Lind @anastasiatl // Sponsored by @always_brand // Boikarabelo lives in Soweto, South Africa. She told me that her favorite subject is math and that she'd like to be a lawyer. "I like to stand for up other people," she said. Boikarabelo also taught me about the seven B’s: “Books Before Boys, Because Boys Bring Babies." Her mother, Nomkululeko, didn’t have access to disposable pads when she was growing up and no one educated her about menstruation. At the time, she was unaware that girls could get pregnant after their periods came. // Every day, all over the world, millions of girls miss school because they lack resources to navigate the onset of menstruation. @always_brand provides puberty education & period products to girls around the world to help keep them confident #LikeAGirl & focused on getting an education. Together we can #EndPeriodPoverty!

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Photo by Anastasia Taylor-Lind @anastasiatl // Sponsored by @always_brand // On an overcast morning, schoolgirls attending Thabotona Primary School in South Africa perform a traditional dance. Menstruation is a taboo topic in poor South African communities, and girls often start menstruating with little information about what’s happening, leading to fear and a lack of knowledge about how to safely manage their cycles. Teachers in South Africa say they do not always feel it is their role to teach girls about menstruation, nor do they have the skills to do so. The cost of period products proves to be a hindrance for many girls in poor communities, but citizens are trying to overcome that obstacle. In 2010, the ANC Youth League started appealing to the government for free sanitary pads in schools, and the movement gained momentum when then President Zuma promised to expand access to sanitary pads a few months later. Many years have passed, but there is still no federal policy or infrastructure put in place to provide free sanitary pads. // Every day, all over the world, millions of girls miss school because they lack resources to navigate the onset of menstruation. @always_brand provides puberty education and& period products to girls around the world to help keep them confident #LikeAGirl & focused on getting an education. Together we can #EndPeriodPoverty!

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Photo by Fritz Hoffmann @fritzphotos | The Tibetan horse racing season is approaching. At the Maqu Gesar races in the Gannan Tibetan prefecture in Gansu, China, a nomad leads a horse across grass fields littered with prayer notes on the way to the race track. To send the prayer notes to higher places, the notes are placed in helium filled balloons, which are let go to rise to the heavens. This week I'm posting pictures from races past, longing to be there myself. Please check out my feed at @fritzphotos#FritzHoffmann#MaquHorseRaces#MaquGrasslands#TibetanHorseFestival#Gannan

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Photo by Ken Geiger @kengeiger | Here, one might say that "simba" translates as "caution, speed bump ahead." But of course simba means "lion" in Swahili. This guy, after spending most of the day feasting on a kudu, decided to take his evening nap in the middle of the road. Speed limits in Kruger National Park are low, making wildlife safety the priority over tourist vehicles. #krugernationalpark#lion#SouthAfricaTo explore more images of the #Africa follow @KenGeiger

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Photo by Paolo Woods and Gabriele Galimberti @paolowoods and @gabrielegalimbertiphoto I Gary S. Settles is a mechanical and nuclear engineer and distinguished professor emeritus at Penn State University in Pennsylvania. He has conducted extensive research on fluid dynamics and flow visualization, and has become a specialist of Schlieren. Schlieren is a process that uses a curved mirror to visualize the flow of air and fluids of varying density. Invented by the German physicist August Toepler in 1864, it is widely used in aeronautical engineering to photograph the flow of air around objects. In this case, he's demonstrating the turbulence caused by hot air from a candle in his lab in State College. This effect is not visible to the naked eye, but Leonardo da Vinci understood that turbulence in the air is similar to turbulence in fluids, a concept that he had intensely studied and that deeply obsessed him. Check our story in @natgeo for more on #leonardodavinci#leonardo#davinci#schlieren#air